CI: Make MSRV Windows check conditional

.justfile

@@ -74,7 +74,7 @@ alias rq := assess-run-watch-quick
 
 # Determine the Minimum Supported Rust Version
 [group: 'develop']
-msrv:
+msrv-find:
     @{{ make_msrv("find", musl_target) }}
     @{{ make_msrv("find", glibc_target) }}
     @{{ make_msrv("find", msvc_target) }}
@@ -405,7 +405,9 @@ alias va := version-assess
 msrv-assess:
     {{ make_msrv("verify", musl_target) }}
     {{ make_msrv("verify", glibc_target) }}
-    {{ make_msrv("verify", msvc_target) }}
+    if rustup toolchain list | grep -q {{ msvc_target }}; then \
+        {{ make_msrv("verify", msvc_target) }} \
+    fi
 
 # Find TODOs
 [group: 'assess']
@@ -524,7 +526,7 @@ msvc_target := "x86_64-pc-windows-msvc"
 default_target := musl_target
 
 debug_vars := 'DEBUG=${DEBUG:-} DEBUG_FILTER=${DEBUG_FILTER:-} RUST_BACKTRACE=${RUST_BACKTRACE:-} RUSTFLAGS=${RUSTFLAGS:-}'
-just_cmd := 'just --timestamp --explain --command-color green'
+just_cmd := 'just --timestamp --command-color green'
 just_cmd_no_ts := 'just --explain --command-color green'
 watch_cmd := "watchexec -qc -r -e rs,toml,html,css --color always -- "
 cover_cmd := 'cargo llvm-cov --color always --ignore-filename-regex "main\.rs|log\.rs"'